🐛 Unconditionally set NegotiatedSerializer

We currently only set the NegotiatedSerializer when there is none set
yet. Unfortunately, various things will break if someone sets their own
in the rest config, hence always set it.

pkg/client/apiutil/apimachinery.go

@@ -158,14 +158,12 @@ func createRestConfig(gvk schema.GroupVersionKind, isUnstructured bool, baseConf
 		protobufSchemeLock.RUnlock()
 	}
 
-	if cfg.NegotiatedSerializer == nil {
-		if isUnstructured {
-			// If the object is unstructured, we need to preserve the GVK information.
-			// Use our own custom serializer.
-			cfg.NegotiatedSerializer = serializerWithDecodedGVK{serializer.WithoutConversionCodecFactory{CodecFactory: codecs}}
-		} else {
-			cfg.NegotiatedSerializer = serializerWithTargetZeroingDecode{NegotiatedSerializer: serializer.WithoutConversionCodecFactory{CodecFactory: codecs}}
-		}
+	if isUnstructured {
+		// If the object is unstructured, we need to preserve the GVK information.
+		// Use our own custom serializer.
+		cfg.NegotiatedSerializer = serializerWithDecodedGVK{serializer.WithoutConversionCodecFactory{CodecFactory: codecs}}
+	} else {
+		cfg.NegotiatedSerializer = serializerWithTargetZeroingDecode{NegotiatedSerializer: serializer.WithoutConversionCodecFactory{CodecFactory: codecs}}
 	}
 
 	return cfg